AP BIOLOGY

CLASSIFICATION

NINE COMMON ANIMAL PHYLA

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Organisms, like sponges, lacking body tissues and body symmetry belong to which of the following phyla?

A	Cnidaria
B	Mollusca
C	Nematoda
D	Porifera

Explanation:

Detailed explanation-1: -Only members of the phylum Porifera (sponges) have no body plan symmetry.

Detailed explanation-2: -The organisms belonging to phylum Porifera are non-motile animals attached to some solid support. There are holes or ‘pores’ all over the body and so these animals are commonly called sponges.

Detailed explanation-3: -Porifera is mostly asymmetrical. Asymmetrical means that any plane traveling through the body’s central axis does not divide the organism into two equal halves.

Detailed explanation-4: -Sponges are unsymmetrical or radially symmetrical, with many cell types but no distinct tissues; their bodies contain numerous pores and sharp protective spicules. Coelenterates (phylum Cnidaria) are radially symmetrical, with two tissue layers (ectoderm and endoderm) surrounding an all-purpose gastrovascular cavity.

There is 1 question to complete.